Accumulated Other Comprehensive Losses: (Components of Accumulated Other Comprehensive Losses, Net Of Taxes) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total accumulated other comprehensive losses	$ (8,028)	$ (9,870)	$ (9,446)	$ (6,311)
Currency translation adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total accumulated other comprehensive losses	(11,175)	(9,320)	(9,467)
Pension and other benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total accumulated other comprehensive losses	(1,405)	(2,461)	(2,589)
Derivatives accounted for as hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total accumulated other comprehensive losses	284	467	241	266
Total accumulated other comprehensive losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total accumulated other comprehensive losses	$ (12,296)	$ (11,314)	$ (11,815)	$ (9,559)